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Label Microoperations CD BR AD ORG O ADD: NOP READ I CALL INDRCT NEXT JMP JMP U ADD U FETCH ORG 4 BRANCH: NOP S JMP OVER NOP U JMP FETCH OVER: NOP ARTPC I CALL INDRCT JMP FETCH ORG 8 STORE: NOP I CALL INDRCT АCTDR WRITE U JMP NEXT U JMP FETCH ORG 12 EXCHANGE: NOP READ I CALL INDRCT U JMP NEXT ACTDR, DRTAC WRITE NEXT FETCH U JMP JMP ORG 64 FETCH: РСТAR JMP NEXT READ, INCPC DRTAR JMP NEXT МАР JMP INDRCT: READ U NEXT DRTAR RET

Label Microoperations CD BR AD ORG O ADD: NOP READ I CALL INDRCT NEXT JMP JMP U ADD U FETCH ORG 4 BRANCH: NOP S JMP OVER NOP U JMP FETCH OVER: NOP ARTPC I CALL INDRCT JMP FETCH ORG 8 STORE: NOP I CALL INDRCT АCTDR WRITE U JMP NEXT U JMP FETCH ORG 12 EXCHANGE: NOP READ I CALL INDRCT U JMP NEXT ACTDR, DRTAC WRITE NEXT FETCH U JMP JMP ORG 64 FETCH: РСТAR JMP NEXT READ, INCPC DRTAR JMP NEXT МАР JMP INDRCT: READ U NEXT DRTAR RET

Computer Networking: A Top-Down Approach (7th Edition)
Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN:9780133594140
Author:James Kurose, Keith Ross
Publisher:James Kurose, Keith Ross
Chapter1: Computer Networks And The Internet
Section: Chapter Questions
Problem R1RQ: What is the difference between a host and an end system? List several different types of end...
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AR

0003

DR

004F

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025

PC

102

 

TABLE 7-2 Symbolic Microprogram (Partial) Label Microoperations CD BR AD ORG O ADD: NOP I CALL INDRCT READ JMP NEXT ADD U JMP FETCH ORG 4 BRANCH: NOP S JMP OVER NOP NOP FETCH INDRCT U JMP OVER: I CALL ARTPC U JMP FETCH ORG 8 NOP АCTDR STORE: I CALL INDRCT U JMP NEXT WRITE JMP FETCH ORG 12 NOP READ EXCHANGE: I CALL INDRCT JMP NEXT ACTDR, DRTAC WRITE JMP NEXT U JMP FETCH ORG 64 FETCH: РСТAR JMP JMP NEXT READ, INCPC NEXT DRTAR U МАР JMP RET INDRCT: READ U NEXT DRTAR U
Transcribed Image Text:TABLE 7-2 Symbolic Microprogram (Partial) Label Microoperations CD BR AD ORG O ADD: NOP I CALL INDRCT READ JMP NEXT ADD U JMP FETCH ORG 4 BRANCH: NOP S JMP OVER NOP NOP FETCH INDRCT U JMP OVER: I CALL ARTPC U JMP FETCH ORG 8 NOP АCTDR STORE: I CALL INDRCT U JMP NEXT WRITE JMP FETCH ORG 12 NOP READ EXCHANGE: I CALL INDRCT JMP NEXT ACTDR, DRTAC WRITE JMP NEXT U JMP FETCH ORG 64 FETCH: РСТAR JMP JMP NEXT READ, INCPC NEXT DRTAR U МАР JMP RET INDRCT: READ U NEXT DRTAR U
TABLE 7-1 Symbols and Binary Code for Microinstruction Fields F1 Microoperation Symbol 00 None NOP ADD CLRAC 001 AC-AC + DR 010 AC+0 11 AC+AC + 1 INCAC 100 AC+DR AR -DR(0–10) DRTAC 101 DRTAR 110 AR -PC PCTAR 111 M[AR]-DR WRITE F2 Microoperation Symbol 000 None NOP 001 AC+AC - DR SUB AC+AC V DR AC+AC A DR DRM[AR] DR +AC 010 OR AND READ АCTDR 011 100 101 110 DR +DR + 1 INCDR 111 DR(0-10) – PC РCTDR F3 Microoperation Symbol 000 None NOP AC+ACO DR AC+AC 001 XOR 010 COM 11 AC+shl AC SHL 100 AC+shr AC SHR ! 101 110 111 РC- РC + 1 INCPC PC+AR ARTPC Reserved CD Condition Symbol Comments 00 Always = 1 DR(15) AC(15) U Unconditional branch 01 I Indirect address bit Sign bit of AC Zero value in AC 10 11 AC = 0 BR Symbol Function 00 JMP CAR +AD if condition = 1 CAR +CAR + 1 if condition = 0 CAR +AD, SBR +CAR + 1 if condition = 1 CAR +CAR + 1 if condition = 0 CAR +SBR (Return from subroutine) CAR(2-5) -DR(11-14), CAR(0,1,6) –0 01 CALL 10 RET 11 МАР
Transcribed Image Text:TABLE 7-1 Symbols and Binary Code for Microinstruction Fields F1 Microoperation Symbol 00 None NOP ADD CLRAC 001 AC-AC + DR 010 AC+0 11 AC+AC + 1 INCAC 100 AC+DR AR -DR(0–10) DRTAC 101 DRTAR 110 AR -PC PCTAR 111 M[AR]-DR WRITE F2 Microoperation Symbol 000 None NOP 001 AC+AC - DR SUB AC+AC V DR AC+AC A DR DRM[AR] DR +AC 010 OR AND READ АCTDR 011 100 101 110 DR +DR + 1 INCDR 111 DR(0-10) – PC РCTDR F3 Microoperation Symbol 000 None NOP AC+ACO DR AC+AC 001 XOR 010 COM 11 AC+shl AC SHL 100 AC+shr AC SHR ! 101 110 111 РC- РC + 1 INCPC PC+AR ARTPC Reserved CD Condition Symbol Comments 00 Always = 1 DR(15) AC(15) U Unconditional branch 01 I Indirect address bit Sign bit of AC Zero value in AC 10 11 AC = 0 BR Symbol Function 00 JMP CAR +AD if condition = 1 CAR +CAR + 1 if condition = 0 CAR +AD, SBR +CAR + 1 if condition = 1 CAR +CAR + 1 if condition = 0 CAR +SBR (Return from subroutine) CAR(2-5) -DR(11-14), CAR(0,1,6) –0 01 CALL 10 RET 11 МАР
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